H2PO4- SELECTIVE CHEMFETS WITH URANYL SALOPHENE RECEPTORS

Chemically modified field effect transistors (CHEMFETs) with ion-selec tive membranes which incorporate lipophilic uranyl salophene derivativ es exhibit H2PO4- selectivities strongly deviating from the Hofmeister series. Selectivity is obtained over much more lipophilic anions such as NO3- (logK(H2PO4,NO3)(Pot) = - 1.3) and Cl- (logK(H2PO4,Cl)(Pot) = - 1.8). Modification of the uranyl salophene derivatives with additio nal hydrogen bond accepting methoxy substituents results in lowered de tection limits and an improved selectivity over Cl-, Br-, SO42- and OH -. (C) 1998 Elsevier Science S.A. All rights reserved.